def urbanmain() = {

  import M5a._

  import scala.concurrent._

  import scala.concurrent.duration._

  import ExecutionContext.Implicits.global

  import scala.language.postfixOps 

  lazy val f = Future {

    val urban_bench = 

      """>+[<+++++++++++++>-]<[[>+>+<<-]>[<+>-]++++++++

  assert(run(urban_bench, Map()) == Map(0 -> 10, 5 -> 0, 1 -> 0, 6 -> 0, 2 -> 0, 7 -> 0, 3 -> 0, 4 -> 0))

  }

  Await.result(f, 32 second)

}